Grate and furnace for steam-boilers



. (No ModeL.) 5 Sheets-Sheet 1.

G. GULIGKSON. GRATE AND FURNACE FOR STEAM BOILERS.

No.880-,'719. PatentedApr. 10, 1888.

- No Model.) 5 Sheets-Sheet 21 G. GULIGKSON.

GRATE AND'FURNAOE FOR STEAM BOILERS. I

No. 380,719. I Patented Apr. 10, 1888.

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(No Model.) 5 Sheets-Sheet 3.

G. GULIOKSON.

GRA'IE AND FURNACE FOR STEAM BOILERS.

No. 380,719. Patented Apr. 10,1888.

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N. PEYERS. Plmuuuwgnphon Washington D. C.

(No'ModeL) 5 Sheets-Sheet 4.

G. GULIGKSON. 'GRATE AND FURNACE FOR STEAM BOILERS:

No. 380,719. Patented Apr. 10, 1888.

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N. PETERS. Pljmmiflfiognpher, Washington. D c.

5 SheetsSheet 5.

(No Model.)

G. GULIOKSON. GRATE AND FURNACE FOR STEAMBOILBRS.

No. 380,719. L

Patented Apr. 10, 1888.

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4 To all lull/07% it may concern.-

UNITED STATES PATENT OFFICE.

GEORGE GULIOKSON, OF CHICAGO, ILLINOIS.

GRATE AND FURNACE FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 380,719, dated April 10, 1888.

Application filed July 96, 1896. Serial No. 209,129.

Be it known that I, Gnonen GULICKSON, a citizen of the United States, residing in Ohi cago, in the county of Cook and State of Illinois, have invented a new and useful Improve ment in Grates and Furnaces for SteanrBoilers, of which the following is a specification.

My invention relates to furnaces for steamboilers.

In the accompanying drawings, which form a part of this specification, and in which similar letters of reference indicate like parts, Figure 1 is a crosssectional view of a furnace embodying my invention. Fig. 2 is a horizontal sectional view taken on line 2 2 of Fig. 1. Fig. 3 is a longitudinal sectional view taken on line 3 3 of Fig. 1. Fig. 4 is an enlarged detail view showing the bearing of the rocker-bar. Fig. 5 is an enlarged longitudinal vertical section showing the sliding dumpplate. Fig. 6 is a front View of a portion of the furnace-front. Figs. 7, 8, and 9 are enlarged detail views of one of the rocker-bars and the ends of the grate bars. Fig. 10 is a detail sectional view showing one of the side gratebars for locking the movable grate-bars in place. It is taken on line 10 of Fig. 2. Fig. 11 is a front view showing the sliding dumpplate and its supports. Fig. 12 is an enlarged detail sectional view showing the mechanism for operating the rocker-bars. Fig. 13 is a plan view showing the lever-socket. Fig. 14 is a perspective view showing the end of the operating-lever. Fig. 15 is a section on line 15 15 of Fig. 1. Fig. 16 is a side elevation of one of the rockerbars, and Figs. 17 and 18 are views illustrating a slight modification specially adapted to the application of the invention to old furnaces. Fig. 19 is a vertical cross-section taken through the center of the arched tile. Fig. 20 is a vertical cross-section through the operating-lever, the handle, and registeringguard, showing the socket in which the removable handle fits.

(No model.)

F F F are the shaking gratebars, mounted upon the rocker-bars D D.

G G are the stationary side or grate bars, whichserve to lock the movable or shaking grate-bars in place.

The side supports or bars, E E, may be embedded in the masonry and supported thereby. These side frame-pieces, E E, are furnished with circular recesses e e, furnished with rounded ledges or projections e e for the ends of the rocker-bars D D. The under or bearing surface of the rocker-bar ends d d is preferably about flat, as illustrated in Fig. 4, and rests directly upon the curved or rounded surface of the ledge c on the frame E, so that the rocker-bar has a rolling or rocking motion upon its bearing. This materially diminishes friction and facilitates the operation of the grates.

Heretofore the rocker-bars have usually had a pivotal or turning motion on their bearing, as coutradistinguished from a rocking or rolling motion, and as these bearings are peculiarly liable to be obstructed by ashes and cinders and the heat of the furnace difficulty has been frequently experienced in their operation. To properly center the rocker-bar upon its bearings and keep it in place, I furnish the bearing ends at of the rocker-bar with a notch or recess, d, in which fits a corresponding projection, 6 on the bearing 0, and the rocker end (I is also furnished with overlapping projections d d at each edge. To compensate for the expansion and contraction of the gratebars in length and the consequent movement of the rocker-bars, the notch or recess (1 is made somewhat wider than the corresponding projection 6 The rocker-bars D are each furnished with two cam-wings or curved projections,rl and d, upon which the shaking grate-bars F rest. Each of the grate-bars F is provided at each end with an open eye or curved recess, f, which fits upon and corresponds in shape to the bearing wings or projections d or d" on the rockerbars D D. The bearing-recessf on each alternate grate-bar fits'at each end upon the lefthand wings or cams, d on the two rocker-bars, and the two rocker-bars are connected together, so that they move in unison and operate to move or raise both ends of the grate-bar at the same time. The other half of the grate-bars, or their bearing recesses or grooves f, fit upon the two right-hand wings or projections, 11*, of the rocker-bars D D. In this way each alternate rocker-bar will be raised while the others are depressed and depressed while the others are raised. The bearing ends of of the rockerbars D are offset, as shown in Fig. 16, so that the under bearingsurface of the same, which rests upon the ledge e, will be on a level with the wings d dt, upon which the grate-bars rest. In this way the grate-bars will be given little endwise movement by the limited rocking motion of the rocker-bar, and the motion of the grate-bars will be chiefly up and down. The grate-bars are each alternately cut away at each end at d (1, so that each grate-bar at each end will have a bearing upon only one of the wings d (1*. The grooves or recessesffin the grate-bars are of a hook shape and somewhat encircle the bearing wings or cams d d on the rockers D, so that the grate-bars cannot be placed upon their rocker-bars except by sliding or lateral movement lengthwise of the rocker-bar, and so that the grate-bars will.

be securely held and fixed upon the rockerbars at each end. The bearing wings or cams cl d do not extend the full length of the rockerbar, but are cut away at each end, as indicated in Figs. 8, 9, and 16, so that the grate-bars may be slipped over the ends of these wings or projections. In Fig. 9 the front grate-bar shown is illustrated as being lowered into position to slip over the end of the rocker-bar wings d 62*. A stationary or lockinggrate-bar, G, fits in at each side of the grate and covers this portion of the rocker-bar D at each end where the bearing wings or cams d d are cut away. These stationary grate-bars are provided with dovetail projections g, which fitin corresponding dovetail projections, 9, cut in the frame-bars E E, whereby the stationary grate-bars are supported and held in place. The projectionsg upon the bars G need be only dovetailed at one end of said bars, the projection 57 at the other end being plain, as indicated at Figs. 2 and 10. The stationary grate-bars G serve to prevent any lateral movement of the grate-bars and to hold them in place.

The rocker-bars D D are provided with arms D, the lower ends of which arms are connected together by a connecting-bar, D ,to

. which said arms are pivoted. Owing to the an operatingarm and connect the two together by a connecting-bar, 'as shown and before described.

' The grate is operated through a connectingrod, H, by-a lever, H, which is pivoted to a bracket, h, secured to the front of the furnace. This lever is provided with a socket, h, at its outer or upper end for the handle H Rigidly secured to the connecting-rod H is a slotted casting or block, H, and to this casting the 'lever H is pivotally connected. The handle H is provided with aprojection or projections, hfiwhich fit in corresponding slots or recesses, hfljin the slottedjcasting or block H so that the handle H can only be inserted into its socket when said socket registers centrally with these little slots or recesses If in the block H that is to say, when the rocker-bars 0ccupy their central position and the upper surfaces of the grate-bars are all level with each other.

By referring to Figs. 12, 13, and 20 it will be readily seen that the registering guard or block Hflwhich is secured rigidly to the reciprocating rod H, will prevent the insertion of the handle H in its socket h in the lever H, except when said lever is so swung or turned on its pivot as to bring the end or socket h in the end of said lever directly under the notches or recesses h cut in the registering block or guard H, so that the pin or projection h on the sides of the handle may pass through said notches or recesses h and thus permit theend of the handle to enter its socket. The overhanging flanges of the guard-block H on each side of its central slot, in which the handle H and lever H play back and forth, likewise prevent the removal of the handle from the socket of the lever, except when the lever is so turned on its pivot that the pin h on the handle will register with the notches or recesses h in the guard-block H thatis to say, when the lever H is in such position as to leave the grate-bars all level. By this means the operating-handle only can be removed from its socket when the grate-bars are all left level with each other. grate, if the surface of the grate is not level and the alternate grate-bars project above the others they are liable to be greatly burned and injured by the heat. I therefore greatly increase the durability of the grate by providing means for always insuring that the surface of the grate is left level after each shaking operation.

J J are my sliding dump-plates at the front end of the grate-bars. They are mounted on suitable guideways, c, on the side and middle stands, 0 O, and slide horizontally beneath the fixed plate J. these sliding dump-plates are operated. Each of the rods J 2 is furnished with a projection, j, which passes through a slotted or notched hole, j, in the front plate of the furnace, so that the sliding dump-plate cannot be moved until its operating-rod is turned in a particular position.

K is the bridge-wall. It is made hollow or provided with a central passage, K, communicating at k with the space beneath the grate and surmounted by a fire-tile, L, furnished with perforations L,which communicate with After shaking the J 2 is the pull-rod by which the fire-space. The central hollow tile M also communicates fresh air from the hollow bridgewall, and thence th rough the central arched tile N and theperforations n to the fire-space. By this means fresh air is led from under the grate to the products of combustion through the perforatiousin the tile I1 and the central arched tile N as said products pass over the bridgewall, thereby materially facilitating combustion and increasing the heat. The two fire-tiles M M on each side of the central tile M, as well as the two arch-tilesNN on each side of the middle arched tileN, I make solid. The arch-tiles N N are made in about the form shown in Fig. 1, and are provided with a notch, n, at each outer end to fit upon a recess in the masonry, and another notch, a, at their lower end to fit upon the vertical tile M.

As shown in Figs. 3, 15, and 19, the fresh air passes from the ashpit or space below the grate through the opening 7c in the bridgewall K into the hollow space K, and it thence passes in part through the perforations L in the tile L and unites with the products of combustion as the same pass over the bridgewall. Part of the fresh air passes from the hollow space K up through the hollow central tile M into the hollow arch-tile N, and thence down through the perforations n in said arched tile-into the firespace, where this part of the fresh air also unites with the products of combustion as the same pass over the bridgewall. By this means the supply of fresh air is admitted from both above and below and the combustion made more perfect.

I11 Figs. 17 and 18 I have shown a form of my invention specially applicable to furnaces already erected. In this case the ends of the frame side bars, E E, ,rest upon the ledges upon which the ends of the old grate bars rested. The grate-bars are cuta little shorter, and the space which would otherwise be left at theirends is filled by angle-plates a: x. The block or casting H is made integral with the connecting-bar D and the arm D on the rockerbar is bentand provided with the socket for the handle H which projects out through the door. In this way I save the necessity of drilling or cutting any holes through the center stand or front of the furnace. In this modification, as shown in Figs. 17 and 18, the operatinglever H, as well as the connecting-rod H, is dispensed with, or, rather, the operating-lever is made integral with the operating-arm D of the rocker-bar, the bearings d e of the rocker-bar thus becoming the fulcrum or pivot of the operating-lever, around which the bent arm D and the handle H", fitted in the socket h in the end of said bent arm, swing as a center. The registering guard or block H, secured on the extended end of the connecting-bar Direciprocates back and forth, while the bent end of the operating-arm Daud the handle-socket h therein move in the arc of a circle around the bearing of the rockerbar D as a center, so that it is obvious that the lever H can only be removed or inserted in its socket in the end of the bent arm 1) when said bent arm is in a certain positionthat is to say, when it or the handle-socket therein registers with the notches or recesses h in the guard-block H on the end of the extended bar D. The guard-block H and the notches or recesses 7L3 therein, as well as the handle H and its pin or projection h used in this modified construction, are precisely the same in construction, function, and operation as before described in relation to the other figures.

The frame bars E E, I prefer to support at the front end on a suitable projection, 19, cast upon the side front stands, 0, as indicated in Fig. 3, and at the rearendupon a suitable lug, p, embedded in the masonry,the frame-bars E being furnished with suitable notches to engage the same, as indicated in said Fig. 3. The locking projection g on the bar G is furnished with a depending notch or projection, 9 that fits over the side of the frame-bar E, and the bar G is also furnished with a projection, 9*, to fit under the bar E, to better lock the parts in place.

I claim 1. The combination, with rockerbars D D, having bearing wings or cams d d, of gratebars F, having bearing eyes or groovesf at each end, the bearing eyes or grooves in the alternate grate-bars fitting on the opposite wings or cams on said rockenbars, substantially as specified.

2. The combination of grate-bars F F with rockerbars D D and frame-pieces or supports EE, furnished with raised ledges c, said rockerbars having a rocking or rolling bearing on the raised ledges e ofsaid frame-pieces or supports, substantially as specified.

3. The combination, with grate-bars provided with bearing eyes or grooves at both ends of said bars, of a pair of rocker-bars pro vided with hearing wings, said bearing eyes or grooves partially encircling said bearingwings, substantially as shown and described, whereby the grate-bars are held in place and adapted to be put in place or removed only over the end of said bearing-wings, substantially as specified.

4. The combination, with shaking grate-bars FF, of rocker-bars D D, upon which said grate bars are mounted, a movable operating-lever connected withsaid rocker-bars and provided with a handle'socket, a handle adapted to be inserted in said socket, and a movable slotted registering guard plate or block provided with a recess through which said handle may beinserted into the socket of said operating-lever when the rooker-bars occupy their normal po sition, said slotted guard plate or block being attached to the movable connecting-rod connecting the operating-lever with the rocker bars, and ,said handle being provided with a projection or enlargement to prevent its insertion or removal except when the socket of the operating-lever registers with the guard-plate and the rocker-bars are thus left in their non mal position, substantially as specified.

IIO

5. In a furnace, the combination, with the grate, of bridgewall K, having a central passage, K, communicating with the space below the grate, fire-tile L, surmounting said bridgewall, provided with perforations L, central hollow tile M, and central hollow arclrtile N, communicating with said tile M and having perforations a, leading into the fire-space, said central hollow tile M communicating with Eail hollow bridge-wall, substantially as speci- 6. In afurnace, thecombinationof thegrate, bridge-wall K, and arch-tile N N N with the central vertical supporting-tile M M M, said tile N N N having notches or offsets n a at their ends, substantially as specified.

7. The combination of the grate-bars F, having open bearing eyes or grooves f and cut away portion 61 d at its ends, and the rocker bars D D, having bearings d d", said bearing wings being cut away at the end to permit the insertion of the gratebars, substantially as specified.

8. The combination oft-he grate-bars F, hav ing open bearing eyes or groovesf and cutaway portion d d at its ends, and the rockerbars D D, having bearingwings d d*, said bearing-wings being cut away at the end to permit the insertion of the grate-bars, said rockevbars having a rocking or rolling anti-friction bearing upon their pivots or supports, substan tially as specified.

9. The combination, with grate bars, of rocker-bars D D and frame-pieces or supports E E, furnished with curved bearing-ledges e c, said rocker'bars D D being furnished with flat bearing ends d d, resting upon said ledgese 6, whereby said rocker-bars are given a rolling motion on said curved bearing-ledges,

substantially as specified.

10. The combination, with grate bars, of rocker-bars D D and frame-pieces or supports E E, furnished with bearing-ledges e c, said rocker-bars D D being furnished with flat bearing ends d d, resting upon said ledges e c, said ledges being provided with projections e e", and said bearing ends d (1 being provided with corresponding notches, d d, substantially as specified.-

11. The combination, with grate-bars F F, having bearinggrooves f, of rocker-bars D D, having each a pair of bearing cams or wings, d d, for said grate-bars, and supports or framepieces E E, having bearing-ledges e 6, said rocker-bars D D having offset bearing ends d d, to bring the center of motion on about a level with said cams or wings d (2, said bearing cams or wings d d on each rocker-bar D engaging each the eyes f of alternate grate-bars, substantially as specified.

12. The combination, with grate-bars F F, having bearing-grooves f, of rocker-bars D D, having bearing cams or wings d d* for said gratebars, supports or frame-pieces E E, having bearing-ledges e 0, said rocker-bars D D having offset bearing ends d d, to bring the center of motion on or about a level with said cams or wings d d*, operating-arms D D, connecting-bar D connecting-rod H, lever H, furnished with a handle-socket, handle H, having projections h", and slotted block H having notch k substantially as specified.

13. The combination, with shaking gratebars, of rocker-bars D, operating-arms D, consuch hook-shaped bearing-grooves, and thus adapted to be inserted in place only over the ends of said cams or wings, and removable stationary locking side grate-bars, G, secured to oneof said pieces E, substantially as specified.

15. The combination, with side frame-pieces or supports, E E, of rocker-bars D D, having wings or cams d d", grate-bars F F, having bearing-grooves f, partially encircling said wings or cams d d", said bearing-grooves f being of a hook shape, and said wings or cams d (1* being enlarged to fit within the hollow of such hook-shaped bearing-grooves, and thus adapted to be inserted in place'only over the ends of said cams or wings, and removable stationarylocking side grate-bars, G G, said bars G G and frame-pieces E E being furnished with interlocking grooves and projections, whereby the bars G G are supported from and secured to said framepicces, substantially as specified.

GEORGE GULIGKSON.

Witnesses:

EDMUND ADoooK, H. M. MUNDAY. 

